autumnal equinox Definition

fall equinox, september equinox, vernal equinox, spring equinox, solstice, equinox, summer solstice, winter solstice, celestial equator, lunisolar calendar, moonrise, tishri, samhain, lunar calendar, kislev, candlemas, walpurgis night, beltane, shawwal, gregorian calendar, lunar eclipse, sidereal, sunrise, moonset, ecliptic, elul, equinoxes, aphelion, perigee, perihelion, perseids, candlemas day, equinoctial point, cheshvan, vernal, capricornus, meteor shower, omer, triduum, daylight savings, rogation, christmastide, simchat torah, celestial sphere, cosmic time, occultation, rosh hashanah, earthshine, gibbous, sextile, asterism, summerlike, shevat, zodiacal light, lupercalia, annular eclipse, calendrical, equator, shavuot, succoth, rosh chodesh, theophany, paschal, sabbath, occulted, intercalary, umbral, phalguna, yahrzeit, sunset, pleiades, heliopause, eastertide, channukah, tropical year, rosh hashana, twilights, chanukkah, northeaster, balmiest, saturnian, tammuz, movable feast, baisakh, galactic equator, aurora australis, greenwich mean time, prime meridian, dusks, ophiuchus, cloudiest, lunar month, magh, solar year, euphorbia pulcherrima, rainless, constellations, latitudes, hilal, lunistice,